package com.wfit.interceptors;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.wfit.utils.JwtHelper;
import com.wfit.utils.Result;
import com.wfit.utils.ResultCodeEnum;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * @author 花满园
 * @date 2024/05/21 21:17
 * Description: 登录包含拦截器，检查请求头是否包含有效token
 * 有，有效，放行
 * 没有，无效，返回504
 */
@Component
public class LoginProtectedInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtHelper jwtHelper;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //从请求头中获取token
        String token=request.getHeader("token");
        //检查是否有效
        boolean expiration = jwtHelper.isExpiration(token);
        //有效放行
        if(!expiration){
            //放行 没有过期
            return true;
        }
        //无效返回504的状态json
        Result result=Result.build(null, ResultCodeEnum.NOTLOGIN);
        ObjectMapper objectMapper = new ObjectMapper();
         String json=objectMapper.writeValueAsString(result);
        response.getWriter().print(json);
        return false;
    }
}
